Louis dee



L. DEE. Watch.

(H0 Model.)

No. -239,738. Patented April 5, 88L

AT T EST Q. W1. 542mm N.PETERS, PHOTO-LITMOGRAPMER. WASH UNITED STATESPATENT OFFICE.

LOUIS DEE, OF LONDON, ENGLAND.

WATCH.

SPECIFICATION forming part of Letters Patent No. 239,738, dated April 5,1881. Application filed September 30, 1880. (N model.) Patented inEngland September 1, 1880.

To all whom it may concern:

Be it known that I, LOUIS DEE, a subject of the Queen of Great Britain,residing at London, England, have invented certain Improvements inVatches, of which the following is a specification.

My improvement consists in providing a watch with two dials, one at thefront, as usual, and one at the back. One of'tliese dials To is figuredand provided with a hand to indicate the hours, and the other is figuredand provided with a hand to indicate the minutes. There is nominute-hand on the hour-dial, and no hour-hand on the minute-dial. Bothdials are made visible to the user of the watch in the customary way.

The advantage of my invention is that it enables the person using thewatch to discover or ascertain the exact time to a minute with greaterfacility than with the ordinary watch,

and with less liability to error.

I am aware that stop-watches, (so called,) for timing races, 850., havebeen provided with a dial on one face for the minute and hour hand, asusual, and a quarter-second dial and hand and a segmental minute dialand hand at the back. This construction, while serving the purpose oftiming for a few minutes, does not at all serve the purpose I seek toac- 0 complish. Indeed, it is not intended to accomplish the samepurpose, as the usual minutehand, arranged to traverse the entire circleof the dial, is employed for ordinary use.

My invention is clearly illustrated in the 5 drawings, wherein Figure 1shows the dial or face for indicating the hours. Fig. 2 shows the dialfor indicating the minutes. Fig. 3 is a cross-section taken through thewateh case, and adapted to show the train of gears by which the handsare connected. Fig. 4 is a view, on a large scale, of the axis uponwhich the hands are mounted and a portion of the gearing.

I may employ various methods of operating" the hands simultaneously orthrough a common train of gears, but the one I will now describe willserve as well as any.

Let A represent the hour-dial, B the hourhand, 0 the minute-dial, and Dthe minutehand. Theminute-hand is mounted on asquare 011 the end of theaxis or arbor E, and rotates therewith, the arbor being driven in theusual way through gearsa mounted on the same. A

pinion or wheel, I), (see Fig. 4,) fixed to the arbor E, meshes with atoothed wheel, 0, and this meshes, in turn, with another toothed wheel,(7, which has four upright pins, 0 0, arranged to engage, as the wheelrotates, one of thetwelre teeth of a ratchet-wheehf, mounted loosely onthe arbor E, and bearing the hourhand. The proportion between the gearsis such that when the arbor has rotated once and the minute-hand haspassed once around the dial the ratchet-wheelf will have advanced onetooth, carrying the hour-hand over onetwelfth of the circle of the dial.Thus, in this arrangement, the hour-hand does not move slowly all thetime, but moves rapidly or springs from one hour-numeral to the next atthe completion of the hour. A spring brake or detent, 9, acts on theratchet in a well-known way to prevent its backward movement. Otherwellknown methods than that shown might, however, be employed, wherebythe hands could be made to move simultaneously, but at different ratesof speed.

As before stated, I do not contemplate employing a minute-hand arrangedto traverse the same dial with the hour-hand, and another or auxiliaryminute-hand 0n the back or opposite face of the watch. My object is notto produce a stop-watch for exceptional circumstances, but a watch forgeneral use with the hour and minute hands on opposite and separatefaces.

Having thus described my invention, 1 claiin-- A watch or pockettimekeeper having an hour-dial and hand and a u'iinute-dial and hand,one dial at the face, and the other at the back, of the watch, and thehands of both dials driven by the same train of gears and arranged tomove around the entire circumferences of their respective dials,substantially as and for the purposes set forth.

LOUIS DEE.

IVitnesses:

W. O. G. RIDGWAY, O. GRossETE'rE,

Notary Public, London.

